I am having a hard time with iTunes recognizing my iPhone. It is not the phone or cable as I took it up to the genius bar and it worked fine up there. I have tried numerous usb ports and I have the same issue with all of them. I assume it is iTunes but am unsure what to do to troubleshoot it. It works about 10% of the time. I am running a 17" PPC 800 MhZ iMac with all my iTunes data on an external Lacie 320GB disk which is getting close to full.